<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<!-- <style>
    *{
        margin: 0;
        padding: 0;
        list-style: none;
    }
    .wrap{
        width: 500px;
        height: 500px;
        background-color: red;
        position: absolute;
        left: 0;
        right: 0;
        bottom: 0;
        top: 0;
        margin: auto;
    }
    .wrap .middle{
        width: 300px;
        height: 300px;
        background-color: yellow;
        position: absolute;
        left: 0;
        right: 0;
        bottom: 0;
        top: 0;
        margin: auto;
    }
    .wrap .middle .inner{
        width: 100px;
        height: 100px;
        background-color: pink;
        position: absolute;
        left: 0;
        right: 0;
        bottom: 0;
        top: 0;
        margin: auto;
    }
</style> -->
<link rel="stylesheet" href="./demoless/oneless.css">
<body>
    <!-- css 
    css预处理语言 less sass 
    less sass 能直接解决权重 能写变量 能写函数
    less sass 不能被浏览器直接识别 需要将这些预编译转变为css 浏览器才可识别

   less   easy less
   sass    easy sass
    -->
    <div class="wrap">
        <div class="middle">
            <div class="inner"></div>
        </div>
    </div>
    <div class="wrap1"></div>
    <ul class="list">
        <li class="item">11</li>
        <li class="item">22</li>
        <li class="item">33</li>
    </ul>
</body>
</html>